I often have good luck softening transients with reverb programs, mixing them to the point where the decay itself is basically inaudible (buried in the mix) but that little bit of interaction serves to just soften up the topside and peaks.
This is a thing I always wondered with Nebula Tape programs.. are they really dynamic? I always push them (Input) and don't hear that tape compression. only saturation (and I know nebula limitation with distortion.) but it is capable of extreme gain reduction... do they capture the dynamic as well of the tapes? I know we are suposed to use it with cdsoundmaster VST plugin VTM. but I dont understand if nebula is capable of compression with no tape compression that is obvious? i'm I missing something?
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You might try Tim Petherick's TNT compressor, it has some DS presets (desser) that might suit you. Adjust the HPF to taste, there are other Nebula comps with HPF on them also like Cupwise stuff that might do the job also. Gemini might have it I forget right now. Depends on what kind of transients you are looking to soften I suppose.